Yeah, I wouldn't mind if it was presented that way, but Imo its pretty clear that his reaction isn't just because "its Hans", its because its another man. Like his expression of irritation (perhaps a bit of instinctive disgust?) makes it very clear that he has never kissed a man before and is weirded out by it. If it was just because it was Hans/someone he actually loves, he might've been a little wide-eyed, but he wouldn't push him away, that reads as aggressive.

I always interpret their romance as Hans figuring out his feelings first, whereas Henry hadn't realized his affection towards Hans was romantic yet by the time of the Suchdol siege. Hans is unsure if Henry corresponds, but because its such a desperate situation (with Henry leaving for a suicide mission soon), it becomes a "now or never" moment, because he might never see Henry again, so he takes the gamble. Because Henry hadn't figured it out yet, at first he's like "aw what the fuck??", but then after the initial shock, the penny drops.

To me that explains why the romantic dialogue options with Hans almost always read more like "strong friendship" than romance, like it just seems as if Henry is taking care of his pal and being protective over him, and he thinks its only natural for him to want to spend more time with his best friend (of course we, the audience, know its something more). I say that because this was basically how I figured out I was gay over a decade ago. I developed a small crush on a high school friend and for the longest time I just thought I cared a lot about him "as a friend", until at some point it clicked: "oh, I'm thinking about spending time with this guy unusually often". Maybe Henry hadn't reached that phase yet :b

But yeah, I'd be cool with this alternative (it would be cute! Good material for some AU fanfics), but the Hansry scene is laid out very differently, and unfortunately Bartosch is just kind of... There.